Filters

[UnderTheRain]

Hi I recently got a skywatcher newt which comes with a 28mm 2" ep and a couple of the baader hyperion 68 eps a 10mm and a 17mm. My question is this which size filters should I get 2" or 1.25"? Reading the baader documentation using 2" filter (inbetween the main body and negative lets group) changes the mm on the hyperions is this a problem? do you not worry about the changed focal length? I assume using a 1.25" doesn't change the mm of the ep's is this correct? Later if I decided to get a filter wheel for photography woukd these filters fit a wheel?

I want a light polution filter and a moon filter to begin with could anyone recommend some? When I have become more familiar with my scope I will expand on these.

Thanks in advance

Brian